Re: Voltage standardisation
6,500 Volts sounds rather high for series arcs, very dangerous even by the rather relaxed standards of the day.
Arcs for lighting large areas were indeed run in series but usually on more modest voltages in the region of 1000 volts.
Alternatively, street lighting arcs were connected in series groups of 8, 9, or 10 lamps between the outers of a standard voltage 3 wire DC system.
When arcs were displaced by high wattage filament bulbs, these series circuits were sometimes retained but fitted with 50 volt, 300 watt tungsten bulbs. This saved altering the wiring and switching arrangements and took advantage of the greater efficiency of 50 volt lamps.
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